拉肚子問題引起的原因很多，請看普渡大學的帖子。皮屑問題，不知道狗狗的皮膚是否有紅腫和異味？

米卡媽的帖子基本涵蓋了如何調理狗狗的肚子

這是普渡大學關於狗狗拉肚子的原因和對策

www.vet.purdue.edu/vth/sacp/documents/TreatmentofDietaryIndiscretionintheDog.pdf

皮屑的問題，是很幹燥的皮屑還是油膩的？如果是油膩的，可能是脂溢性皮炎
www.uhs.umich.edu/dandruff

loudoun.nvcc.edu/vetonline/vet211/skin%20dx.htm
SEBORRHEA

Seborrhea is a skin disease in dogs caused by a defect in keratinization of the skin cell layers. There is a build up of scale and sebum that results in a greasy dandruff appearance to the skin and hair. Often there is inflammation and infection associated with it, and a characteristic odor is often noted.

不要經常給狗狗洗澡，我家丘丘的毛跟金毛一樣多，大約2個月或3個月洗一次，但是一定要至少一周梳透一次